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How to plug crank oil galleys after ball removal

Posted by BogusSVO, Dec 15, 2013

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  1. BogusSVO

    BogusSVO Proven Member

    Joined Jul 1, 2009
    Pensacola, Florida
    How to plug the crank oil galleys

    I have spoken out about removing the oil galleys balls in the crank.

    So once the balls are out

    So all the crud can be removed.

    After you have gotten most of the crud out, spray with brake cleaner.
    Then use a small brush to scrub the galley.
    Then spray some more brake cleaner, and blow out with compressed air.

    Next have a new tap, and some sleeve retaining loc-tite
    6 bolt cranks use a 5/16 x 18 tap and set screw (3/8 long)
    7bolt cranks use a ¼ x 20 tap and set screw (1/2 long)

    Caution must be used when tapping the crank so you do not snap the tap off in the crank.

    Again spray with brake clean and blow out with compressed air.
    Apply the green sleeve retaining loc-tite and screw in the set screw.
    After tighten the set screws, take a blunted center punch and peen a few spots around the set screw.

    This will deform the threads in both the crank and set screw so it cannot vibrate out.
    Now you have a crank that you do not have to worry about the crud becoming loose and being carried into the bearings.
    Strm Trpr and miliman13 like this.
  2. fun kart kid

    fun kart kid Proven Member

    Joined Sep 8, 2008
    bedford, Pennsylvania
    Just curious if you have ever removed a set of set screws from a crank. After its been ran say to freshen after a season? And what are your thoughts on grinding a 4g63 crank ?

    491  0

    1991 Mitsubishi Galant VR-4
    12.569 @ 120.550 · Galant VR-4
  3. BogusSVO

    BogusSVO Proven Member

    Joined Jul 1, 2009
    Pensacola, Florida
    I have no issue installing a ground crank in a 4g. Also add to the fact that most all the cranks are over 20 years old finding a spec std crank can be a challenge.
    My rule of thumb is a .25mm/.25mm in an H beam rod engine
    .50mm/.50mm in a stock rod engine.

    For removing the set screws, I have not come across one yet that I need to. But when the time comes, Ill figure a way too.

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